From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Emanuel Berg via Users list for the GNU Emacs text editor Newsgroups: gmane.emacs.help Subject: Re: Elisp function that performs numeric computations Date: Fri, 21 Jan 2022 12:39:20 +0100 Message-ID: <87wnittj13.fsf@zoho.eu> References: <87czkoezg4.fsf@mbork.pl> Reply-To: Emanuel Berg Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="20121"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:sWtGgGni/hcntSB46/d6yUCc6Ww= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Fri Jan 21 12:42:36 2022 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1nAsJQ-00051u-9O for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 21 Jan 2022 12:42:36 +0100 Original-Received: from localhost ([::1]:50152 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nAsJP-0002Ra-1h for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 21 Jan 2022 06:42:35 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:41452) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nAsGY-00013Y-GG for help-gnu-emacs@gnu.org; Fri, 21 Jan 2022 06:39:38 -0500 Original-Received: from ciao.gmane.io ([116.202.254.214]:37630) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nAsGQ-0004wo-4O for help-gnu-emacs@gnu.org; Fri, 21 Jan 2022 06:39:31 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1nAsGN-00016c-JL for help-gnu-emacs@gnu.org; Fri, 21 Jan 2022 12:39:27 +0100 X-Injected-Via-Gmane: http://gmane.org/ Mail-Followup-To: help-gnu-emacs@gnu.org Mail-Copies-To: never Received-SPF: pass client-ip=116.202.254.214; envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:135469 Archived-At: fatiparty--- via Users list for the GNU Emacs text editor wrote: >>>>> "Compute depth to use." >>>>> (interactive) >>>>> >>>>> (let* ( (j rptdepth) >>>>> (w (- maxdepth j)) >>>>> (p (+ w 1)) >>>>> (r (mod (- depth maxdepth 1) p) ) >>>>> (o (+ j r)) ) >>>>> o)) >>>>> >>> >>> I would like to adapt the function a little bit more. If >>> depth <= maxdepth I want to set o=depth instead of >>> performing the computation shown for the variable o. >>> >> >> Did I get it right, I wonder? >> >> (defun test (depth maxdepth rptdepth) >> (if (<= depth maxdepth) >> depth >> (+ rptdepth >> (mod (- depth maxdepth 1) >> (- maxdepth rptdepth -1))))) >> >> Is it how true (E)Lisp'er would write it? >> > > What you have done is good. But although you have got to > a simple solution, I want to code the more complicated > solution for the case where let* is involved (within which > local variables are defined). The reason there is no `let' (or `let*') in his code is because there is no repitition of computation patterns ... As for "Is it how true (E)Lisp'er would write it?" I'd write it, whatever it is, like this: (defun organov (dep top rep) (if (<= dep top) dep (+ rep (mod (1- (- dep top)) (1+ (- top rep)) )))) Elispers at work! -- underground experts united https://dataswamp.org/~incal